GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Infusorial (?), a. (Zool.) Belonging to the Infusoria; composed of, or containing, Infusoria; as, “infusorial earth”.
   
   [1913 Webster]
   
   Infusorial earth (Geol.), a deposit of fine, usually white, siliceous material, composed mainly of the shells of the microscopic plants called diatoms; also called diatomaceous earth, kieselguhr, and diatomite. It is used in polishing powder, and in the manufacture of dynamite.
   
   [1913 Webster +PJC]